OHIO STATE UNIV RESEARCH FOUNDATION COLUMBUS
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An apparatus using metal tubes was fabricated for studying the differential seebeck coefficient of liquid materials. Ceramic spacers about 12-in. long whose outside diameters were the same as the inside diameter of the outer metal tube, were placed on the inner stainless tube at 12-in. intervals. The space between the ceramic spacers was filled with powdered Na2O.6V2O5 I. Other components and characteristics included the outer stainless steel tube, a water cooling coil, a cooling air inlet, a cooling air outlet, a thermocouple for the outside temperature of the outer tube, and a thermocouple for the inside temperature of the inner tube. The composite tube placed inside a tubular furnace so that only the central part of the tube was heated. A very small emf was generated for various temperature differences. A similar composite tube was built only 1-in. long with I in the middle and the ends sealed by ceramic spacers. A large emf was generated for a small temperature difference.